Custom terrain generation in MCBE 

Just messing around with the beta's API.
Some technical info:
As shown in the video, the terrain generation is very slow. This is because the size of one chunk is 4x4 (Normal is 16x16). The reason for this is to prevent my Minecraft from lagging a lot (right now it runs at an average of 20ms, while 16x16 is about 200ms if I remembered correctly)
Minecraft version: Bedrock 1.21.2